//import javax.servlet.ServletException;
//import javax.servlet.annotation.WebServlet;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import java.io.IOException;
//@WebServlet("/feifei.html")
//public class FeifeiServlet extends HttpServlet {
//    @Override
//    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        String referer = req.getHeader("Referer");
//        System.out.println(referer);
//        if(referer==null){
//            resp.sendRedirect("/day31HomeWork/fail.html");
//        }else {
//            req.getRequestDispatcher("/WEB-INF/feifei.html").forward(req,resp);
//        }
//
//    }
//}
